<template>
	<view class="uni-swiper__warp">
		<slot />
		<view v-if="mode === 'default'" :style="{ 'bottom': dots.bottom + 'rpx' }" class="uni-swiper__dots-box"
			key='default'>
			<view v-for="(item, index) in info" @click="clickItem(index)" :style="{
				'width': (index === current ? dots.width * 2 : dots.width) + 'rpx', 'height': dots.width / 2 + 'rpx', 'background-color': index !== current ? dots.backgroundColor : dots.selectedBackgroundColor, 'border-radius': '0px'
			}" :key="index" class="uni-swiper__dots-item uni-swiper__dots-bar" />
		</view>
		<view v-if="mode === 'dot'" :style="{ 'bottom': dots.bottom + 'rpx' }" class="uni-swiper__dots-box" key='dot'>
			<view v-for="(item, index) in info" @click="clickItem(index)" :style="{
				'width': dots.width + 'rpx', 'height': dots.height + 'rpx', 'background-color': index !== current ? dots.backgroundColor : dots.selectedBackgroundColor, 'border': index !== current ? dots.border : dots.selectedBorder
			}" :key="index" class="uni-swiper__dots-item" />
		</view>
		<view v-if="mode === 'round'" :style="{ 'bottom': dots.bottom + 'rpx' }" class="uni-swiper__dots-box"
			key='round'>
			<view v-for="(item, index) in info" @click="clickItem(index)"
				:class="[index === current && 'uni-swiper__dots-long']" :style="{
					'width': (index === current ? dots.width * 3 : dots.width) + 'rpx', 'height': dots.height + 'rpx', 'background-color': index !== current ? dots.backgroundColor : dots.selectedBackgroundColor, 'border': index !== current ? dots.border : dots.selectedBorder
				}" :key="index" class="uni-swiper__dots-item " />
		</view>
		<view v-if="mode === 'nav'" key='nav' :style="{ 'background-color': dotsStyles.backgroundColor, 'bottom': '0' }"
			class="uni-swiper__dots-box uni-swiper__dots-nav">
			<text :style="{ 'color': dotsStyles.color }" class="uni-swiper__dots-nav-item">{{ (current + 1) + "/" +
				info.length
				+ ' ' + info[current][field] }}</text>
		</view>
		<view v-if="mode === 'indexes'" key='indexes' :style="{ 'bottom': dots.bottom + 'rpx' }"
			class="uni-swiper__dots-box">
			<view v-for="(item, index) in info" @click="clickItem(index)" :style="{
				'width': dots.width + 'rpx', 'height': dots.height + 'rpx', 'color': index === current ? dots.selectedColor : dots.color, 'background-color': index !== current ? dots.backgroundColor : dots.selectedBackgroundColor, 'border': index !== current ? dots.border : dots.selectedBorder
			}" :key="index" class="uni-swiper__dots-item uni-swiper__dots-indexes"><text
					class="uni-swiper__dots-indexes-text">{{ index + 1 }}</text></view>
		</view>
	</view>
</template>

<script>

/**
 * SwiperDod 轮播图指示点
 * @description 自定义轮播图指示点
 * @tutorial https://ext.dcloud.net.cn/plugin?id=284
 * @property {Number} current 当前指示点索引，必须是通过 `swiper` 的 `change` 事件获取到的 `e.detail.current`
 * @property {String} mode = [default|round|nav|indexes] 指示点的类型
 * 	@value defualt 默认指示点
 * 	@value round 圆形指示点
 * 	@value nav 条形指示点
 * 	@value indexes 索引指示点
 * @property {String} field mode 为 nav 时，显示的内容字段（mode = nav 时必填）
 * @property {String} info 轮播图的数据，通过数组长度决定指示点个数
 * @property {Object} dotsStyles 指示点样式
 * @event {Function} clickItem 组件触发点击事件时触发，e={currentIndex}
 */

export default {
	name: 'UniSwiperDot',
	emits: ['clickItem'],
	props: {
		info: {
			type: Array,
			default() {
				return []
			}
		},
		current: {
			type: Number,
			default: 0
		},
		dotsStyles: {
			type: Object,
			default() {
				return {}
			}
		},
		// 类型 ：default(默认) indexes long nav
		mode: {
			type: String,
			default: 'default'
		},
		// 只在 nav 模式下生效，变量名称
		field: {
			type: String,
			default: ''
		}
	},
	data() {
		return {
			dots: {
				width: 6,
				height: 6,
				bottom: 20,
				color: '#fff',
				backgroundColor: 'rgba(0, 0, 0, .3)',
				border: '1px rgba(0, 0, 0, .3) solid',
				selectedBackgroundColor: '#333',
				selectedBorder: '1px rgba(0, 0, 0, .9) solid'
			}
		}
	},
	watch: {
		dotsStyles(newVal) {
			this.dots = Object.assign(this.dots, this.dotsStyles)
		},
		mode(newVal) {
			if (newVal === 'indexes') {
				this.dots.width = 14
				this.dots.height = 14
			} else {
				this.dots.width = 6
				this.dots.height = 6
			}
		}

	},
	created() {
		if (this.mode === 'indexes') {
			this.dots.width = 12
			this.dots.height = 12
		}
		this.dots = Object.assign(this.dots, this.dotsStyles)
	},
	methods: {
		clickItem(index) {
			this.$emit('clickItem', index)
		}
	}
}
</script>

<style lang="scss">
.uni-swiper__warp {
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex: 1;
	flex-direction: column;
	position: relative;
	overflow: hidden;
}

.uni-swiper__dots-box {
	position: absolute;
	bottom: 20rpx;
	left: 0;
	right: 0;
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex: 1;
	flex-direction: row;
	justify-content: center;
	align-items: center;
}

.uni-swiper__dots-item {
	width: 8px;
	border-radius: 100px;
	margin-left: 6px;
	background-color: rgba(0, 0, 0, 0.4);
	/* #ifndef APP-NVUE */
	cursor: pointer;
	/* #endif */
	/* #ifdef H5 */
	// border-width: 5px 0;
	// border-style: solid;
	// border-color: transparent;
	// background-clip: padding-box;
	/* #endif */
	// transition: width 0.2s linear;  不要取消注释，不然会不能变色
}

.uni-swiper__dots-item:first-child {
	margin: 0;
}

.uni-swiper__dots-default {
	border-radius: 100px;
}

.uni-swiper__dots-long {
	border-radius: 50px;
}

.uni-swiper__dots-bar {
	border-radius: 50px;
}

.uni-swiper__dots-nav {
	bottom: 0px;
	// height: 26px;
	padding: 8px 0;
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	flex: 1;
	flex-direction: row;
	justify-content: flex-start;
	align-items: center;
	background-color: rgba(0, 0, 0, 0.2);
}

.uni-swiper__dots-nav-item {
	/* overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap; */
	font-size: 14px;
	color: #fff;
	margin: 0 15px;
}

.uni-swiper__dots-indexes {
	/* #ifndef APP-NVUE */
	display: flex;
	/* #endif */
	// flex: 1;
	justify-content: center;
	align-items: center;
}

.uni-swiper__dots-indexes-text {
	color: #fff;
	font-size: 12px;
	line-height: 14px;
}
</style>
